Effect of land management without farmyard manure application on the amount and the activity of soil microbial biomass
2003
Stevlikova, T. | Vjatrakova, J. | Javorekova, S. | Mateova, S. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic))
Four kinds of cereal crops were grown without farmyard manure application. The effect of farmyard manure was supposed to be replaced by post-harvest residues (PH treatment) or by ploughing the total by-product, i.e. straw (PZ treatment) into soil. After seven years of application, this soil farming system did not influence the contents of Cox and Nt in soil. The amount of organic carbon had declined after the first year, but in the following years it remained at the same level (1.2%). The total nitrogen content increased from 0.143 to 0.166% without any considerable difference between the treatments. The amount of microbial biomass (Cmic) in PH treatment had been varying and in 2000 it decreased approximately by a half (from 215.96 to 132.00 mg C/kg of soil dry matter). The input of organic matter due to ploughing the whole by-product (PZ treatment) into soil acted favourably and the value of Cmic in 2000 was quite comparable with the average values of the individual years of 1994-1997.
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